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  <title>The SplDoublyLinkedList class</title>

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 <h1 class="title">The SplDoublyLinkedList class</h1>
 
 
 <div class="partintro"><p class="verinfo">(PHP 5 &gt;= 5.3.0)</p>
 

  <div class="section" id="spldoublylinkedlist.intro">
   <h2 class="title">简介</h2>
   <p class="para">
    The SplDoublyLinkedList class provides the main functionalities of a doubly linked list.
   </p>
  </div>

 
  <div class="section" id="spldoublylinkedlist.synopsis">
   <h2 class="title">类摘要</h2>
 

   <div class="classsynopsis">
    <div class="ooclass"></div>
 


    <div class="classsynopsisinfo">
     <span class="ooclass">
      <strong class="classname">SplDoublyLinkedList</strong>
     </span>

     <span class="oointerface">implements 
      <span class="interfacename"><strong class="interfacename">Iterator</strong></span>
     </span>

     <span class="oointerface">, 
      <span class="interfacename"><strong class="interfacename">ArrayAccess</strong></span>
     </span>
 
     <span class="oointerface">, 
      <span class="interfacename"><a href="class.countable.html" class="interfacename">Countable</a></span>
     </span>
 
     {</div>

 
    
 
    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 方法 */</div>
    <div class="constructorsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><a href="spldoublylinkedlist.construct.html" class="methodname">__construct</a></span>
    ( <span class="methodparam">void</span>
   )</div>

    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.bottom.html" class="methodname">bottom</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">int</span><span class="methodname"><a href="spldoublylinkedlist.count.html" class="methodname">count</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.current.html" class="methodname">current</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">int</span><span class="methodname"><a href="spldoublylinkedlist.getiteratormode.html" class="methodname">getIteratorMode</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">bool</span><span class="methodname"><a href="spldoublylinkedlist.isempty.html" class="methodname">isEmpty</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.key.html" class="methodname">key</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.next.html" class="methodname">next</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">bool</span><span class="methodname"><a href="spldoublylinkedlist.offsetexists.html" class="methodname">offsetExists</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$index</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.offsetget.html" class="methodname">offsetGet</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$index</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.offsetset.html" class="methodname">offsetSet</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$index</code></span>
   , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$newval</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.offsetunset.html" class="methodname">offsetUnset</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$index</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.pop.html" class="methodname">pop</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.prev.html" class="methodname">prev</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.push.html" class="methodname">push</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$value</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.rewind.html" class="methodname">rewind</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">string</span><span class="methodname"><a href="spldoublylinkedlist.serialize.html" class="methodname">serialize</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.setiteratormode.html" class="methodname">setIteratorMode</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.shift.html" class="methodname">shift</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">mixed</span><span class="methodname"><a href="spldoublylinkedlist.top.html" class="methodname">top</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.unserialize.html" class="methodname">unserialize</a></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$serialized</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">void</span><span class="methodname"><a href="spldoublylinkedlist.unshift.html" class="methodname">unshift</a></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$value</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">bool</span><span class="methodname"><a href="spldoublylinkedlist.valid.html" class="methodname">valid</a></span>
    ( <span class="methodparam">void</span>
   )</div>

   }</div>
 
  </div>
 

 
 </div>
 
 






























































































 
























 

















 
<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="spldoublylinkedlist.bottom.html">SplDoublyLinkedList::bottom</a> — Peeks at the node from the beginning of the doubly linked list</li><li><a href="spldoublylinkedlist.construct.html">SplDoublyLinkedList::__construct</a> — Constructs a new doubly linked list</li><li><a href="spldoublylinkedlist.count.html">SplDoublyLinkedList::count</a> — Counts the number of elements in the doubly linked list.</li><li><a href="spldoublylinkedlist.current.html">SplDoublyLinkedList::current</a> — Return current array entry</li><li><a href="spldoublylinkedlist.getiteratormode.html">SplDoublyLinkedList::getIteratorMode</a> — Returns the mode of iteration</li><li><a href="spldoublylinkedlist.isempty.html">SplDoublyLinkedList::isEmpty</a> — Checks whether the doubly linked list is empty.</li><li><a href="spldoublylinkedlist.key.html">SplDoublyLinkedList::key</a> — Return current node index</li><li><a href="spldoublylinkedlist.next.html">SplDoublyLinkedList::next</a> — Move to next entry</li><li><a href="spldoublylinkedlist.offsetexists.html">SplDoublyLinkedList::offsetExists</a> — Returns whether the requested $index exists</li><li><a href="spldoublylinkedlist.offsetget.html">SplDoublyLinkedList::offsetGet</a> — Returns the value at the specified $index</li><li><a href="spldoublylinkedlist.offsetset.html">SplDoublyLinkedList::offsetSet</a> — Sets the value at the specified $index to $newval</li><li><a href="spldoublylinkedlist.offsetunset.html">SplDoublyLinkedList::offsetUnset</a> — Unsets the value at the specified $index</li><li><a href="spldoublylinkedlist.pop.html">SplDoublyLinkedList::pop</a> — Pops a node from the end of the doubly linked list</li><li><a href="spldoublylinkedlist.prev.html">SplDoublyLinkedList::prev</a> — Move to previous entry</li><li><a href="spldoublylinkedlist.push.html">SplDoublyLinkedList::push</a> — Pushes an element at the end of the doubly linked list</li><li><a href="spldoublylinkedlist.rewind.html">SplDoublyLinkedList::rewind</a> — Rewind iterator back to the start</li><li><a href="spldoublylinkedlist.serialize.html">SplDoublyLinkedList::serialize</a> — Serializes the storage</li><li><a href="spldoublylinkedlist.setiteratormode.html">SplDoublyLinkedList::setIteratorMode</a> — Sets the mode of iteration</li><li><a href="spldoublylinkedlist.shift.html">SplDoublyLinkedList::shift</a> — Shifts a node from the beginning of the doubly linked list</li><li><a href="spldoublylinkedlist.top.html">SplDoublyLinkedList::top</a> — Peeks at the node from the end of the doubly linked list</li><li><a href="spldoublylinkedlist.unserialize.html">SplDoublyLinkedList::unserialize</a> — Unserializes the storage</li><li><a href="spldoublylinkedlist.unshift.html">SplDoublyLinkedList::unshift</a> — Prepends the doubly linked list with an element</li><li><a href="spldoublylinkedlist.valid.html">SplDoublyLinkedList::valid</a> — Check whether the doubly linked list contains more nodes</li></ul>
</div>
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